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Influence of Nitrogen and Rhizobium Japonicum On the Activity of Heteroidera Glycines 1)

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For more content, see Nematology.

Greenhouse experiments were conducted to determine the effects of source and concentration of nitrogen (N) as well as inoculation of soybean with Rhizobium japonicum (R) on the activity of Heterodera glycines (SCN). The application of NaNO3 or NH4NO3 at 56 to 896 ppm N to soil or silica sand reduced nematode hatch, penetration and "cyst" development of SCN on soybean. Inhibitory effects were positively correlated with concentration of N. Concentrations of > 112 ppm N also reduced numbers of eggs per cyst. High concentrations of NaCl also resulted in slight inhibition of nematode penetration of host roots as compared to demineralized water. Since most N concentrations used (56-225 ppm) were below those necessary to give an osmotic inhibitory effect on nematode activity and since R also interfered with nematode development, it was concluded that N has a direct inhibitory effect on SCN. Simultaneous inoculations of nodulating (Nod) and nonnodulating (Nonnod) isogenic lines of soybean with R and SCN (minus N), as compared to SCN alone, reduced the number of cysts developing especially on the Nod line.

Affiliations: 1: Department of Plant Pathology, North Carolina State University, Raleigh, North Carolina 27607, U.S.A.


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